Agegraphic dark energy: growth index and cosmological implications

作者：Malekjani M^*; Basilakos S; Mehrabi A; Davari Z; Rezaei M

来源：Monthly Notices of the Royal Astronomical Society, 2017, 464(1): 1192-1201.

DOI：10.1093/mnras/stw2426

• methods: analytical
• cosmology: theory
• dark energy
• large scale structure of Universe

We study the main cosmological properties of the agegraphic dark energy model at the expansion and perturbation levels. Initially, using the latest cosmological data, we implement a joint likelihood analysis in order to constrain the cosmological parameters. Then, we test the performance of the agegraphic dark energy model at the perturbation level and we define its difference from the usual Lambda cold dark matter (Lambda CDM) model. Within this context, we verify that the growth index of matter fluctuations depends on the choice of the considered agegraphic dark energy (homogeneous or clustered). In particular, assuming a homogeneous agegraphic dark energy, we find, for the first time, that the asymptotic value of the growth index is gamma approximate to 5/9, which is close to that of the usual Lambda cosmology, gamma((Lambda)) approximate to 6/11. Finally, if the distribution of dark energy is clustered, then we obtain. gamma approximate to 1/2 which is similar to 8 per cent smaller than that of the Lambda CDM model.

• 出版日期2017-1